The gamelan orchestras of Java and Bali are among the most distinctive musical ensembles in the world — built on bronze metallophone technology, colotomic structure, and a theory of musical time fundamentally different from Western approaches.
THE GAMELAN: A COMPLETE MUSICAL WORLD
The gamelan is not a single instrument but an ensemble — a matched set of percussion instruments (primarily bronze metallophones and gongs) tuned to each other and to no other gamelan. Each gamelan is unique: its tuning, its name, its history, and often its personality. To play a gamelan is to enter a complete musical world contained within that instrument set.
The two primary traditions are Javanese gamelan and Balinese gamelan, sharing common roots but distinct in sound, texture, aesthetic values, and social function. Javanese gamelan is associated with the courts of Yogyakarta and Surakarta (Solo) — the refinement (alus) aesthetic is paramount: quiet, smooth, contemplative. Balinese gamelan is associated with temple ceremonies and competitive performance — bright, fast, interlocking, virtuosic.
COLOTOMIC STRUCTURE
The organizational principle of gamelan music is colotomy — the structuring of musical time by a hierarchy of gong strokes. At the deepest level, the gong ageng (great gong) marks the end of the largest structural unit (gongan). Within each gongan, smaller gongs (kempul, kenong, kethuk) mark subdivisions at regular intervals. The entire ensemble orients itself to these gong punctuations, which define musical time in a fundamentally cyclic rather than linear way.
The cycle (gongan) may be 8, 16, 32, or 64 beats long; a single piece may consist of dozens or hundreds of repetitions of the cycle, each with different melodic elaborations. Time in gamelan music is not divided into bars of equal duration but into a hierarchical nested structure: the largest gong stroke is the most significant, the smallest subdivisions are the least. This is the inverse of Western metric structure, where the downbeat is the strongest and subdivisions are progressively weaker.
THE BALUNGAN AND ITS ELABORATIONS
The skeletal melody of a gamelan piece is the balungan (literally "skeleton") — a slow, simple melodic line from which all other parts derive. Different instruments elaborate the balungan in different ways determined by their position in the hierarchy: the faster instruments (saron panerus, bonang barung) play rapid figurations; the slower instruments (demung, saron) play the balungan itself; the rebab (two-string spike fiddle), suling (bamboo flute), and gerong (male chorus) add melodic elaboration above.
This heterophonic texture — in which multiple instruments simultaneously perform different elaborations of the same underlying melody — is characteristic of much Southeast Asian music and quite different from either Western harmony (simultaneous independent voices) or African polyrhythm (simultaneous independent rhythmic layers).
MANTLE HOOD AND BI-MUSICALITY AT UCLA
The concept of bi-musicality — that ethnomusicologists should learn to perform the music they study — was developed by Mantle Hood in direct response to his study of Javanese gamelan. Hood established the first university gamelan ensemble in North America at UCLA in 1958, and the model spread to hundreds of universities worldwide. Learning to play gamelan physically — to coordinate with the colotomic structure, to know when the gong falls, to feel the elaborating parts as elaborations of a common skeleton — teaches things about the music that listening alone cannot.
The Society for Ethnomusicology maintains a list of university gamelan ensembles in North America, Europe, and Australia.
BALINESE GAMELAN AND KECAK
Balinese gamelan is organized around the principle of kotekan — interlocking patterns (norot) between pairs of instruments tuned a small interval apart (producing the characteristic shimmering "beating" sound of Balinese gamelan). The two parts of a kotekan pair are polos ("plain") and sangsih ("different") — neither is complete without the other.
Kecak ("Monkey Dance") is a Balinese ritual performance in which a large chorus of men performs rhythmic vocal interlocking patterns (chak-a-chak) while enacting scenes from the Ramayana. It was developed in the 1930s in collaboration with the German artist Walter Spies — an example of how "traditional" performances sometimes have a complex modern history of invention and reinvention.
PHILIPPINE KULINTANG AND CONTINENTAL SOUTHEAST ASIA
Southeast Asian music extends far beyond the Indonesian archipelago. The kulintang — a row of knobbed bronze gongs played melodically — is the central instrument of musical traditions across the southern Philippines, eastern Indonesia, and parts of Malaysia and Brunei. The kulintang tradition is one of the oldest gong-chime traditions in Southeast Asia and represents a distinct musical system with its own theoretical frameworks, social functions, and performance contexts.
Continental Southeast Asia — Vietnam, Cambodia, Thailand, Myanmar, Laos — has distinct musical traditions in each country, sharing some influences from Indian classical music (via the ancient Indianized kingdoms of the region) and Chinese music (via northern border contact). Thai classical music (piphat ensemble), Khmer court music, and Vietnamese ca trù chamber music are each worthy of full study in their own right.
SLENDRO AND PELOG: GAMELAN TUNING SYSTEMS
Gamelan instruments are tuned to one of two scale systems: slendro (a roughly equidistant five-note scale, sometimes loosely compared to a pentatonic scale but with characteristic deviations from any equal-tempered equivalent) or pelog (a seven-note scale from which subset pentatonic modes called pathet are drawn). Each gamelan is tuned to a unique compromise within these systems; no two gamelans have identical tunings. Many large court gamelans consist of two complete instrument sets — one in slendro and one in pelog — placed at right angles to each other so that performers can move between systems for different repertoire. The cognitive demand of mastering both systems within a single ensemble is one indicator of the sophistication required of a senior gamelan musician.
PATHET AND MUSICAL TIME OF DAY
Within each scale system, multiple pathet (modal categories) define which pitches are emphasized as tonal centers and which characteristic phrases are appropriate. Pathet are associated with specific times of night during the all-night wayang kulit shadow-puppet performances, which traditionally last from approximately nine in the evening to dawn. Pathet nem opens the performance, pathet sanga begins around midnight, and pathet manyura governs the closing hours. This association between modal category and time of day parallels the time theory of Hindustani raga, though the underlying conception is different: in Java, the pathet structure encodes the dramatic arc of the wayang epic, not the diurnal cycle as such.
THE WAYANG KULIT TRADITION
The wayang kulit (shadow puppet theater) of Java is one of the most complete art forms in the world: it integrates puppetry, narrative recitation (the dalang or puppet-master speaks all the characters' voices), live gamelan accompaniment, and dance gesture into performances drawn from the Hindu Mahabharata and Ramayana epics. UNESCO inscribed wayang on the Representative List of Intangible Cultural Heritage in 2003. A senior dalang must memorize hundreds of hours of narrative material, cue the gamelan with specific signals, manipulate dozens of puppets through stylized choreography, and improvise topical commentary within the inherited narrative — all while sitting cross-legged on a low platform for an entire night.
THAI, CAMBODIAN, AND VIETNAMESE CLASSICAL TRADITIONS
Thai piphat music — the classical music of the Thai royal courts and Buddhist temples — uses a heptatonic equidistant tuning system (in which all seven intervals of the octave are roughly equal) and an ensemble of ranat (xylophones), khong wong (gong circles), pi (oboe-like double-reed wind), and percussion. Cambodian pinpeat music, structurally similar to Thai piphat (the two traditions share common Khmer-Mon roots), accompanies court dance and Buddhist ceremony. Vietnamese nhã nhạc (court music) — inscribed by UNESCO in 2003 — was the formal music of the Nguyen dynasty in Hue. Vietnamese ca trù chamber music, also UNESCO-inscribed, is a sophisticated tradition of solo female vocal performance accompanied by the đàn đáy lute and a small drum. Each of these continental Southeast Asian traditions deserves a course of its own.
EXERCISE: COLOTOMIC LISTENING
Find a recording of Javanese gamelan (Smithsonian Folkways has several; the Loeb Music Library at Harvard has digitized collections). Listen for the gong — the deepest, most resonant sound — and count the beats between each gong stroke. Then identify a smaller gong-like sound that occurs more frequently. Draw a simple diagram showing the hierarchical structure you hear. Compare this time organization to a Western phrase-and-cadence structure from your form and analysis lessons.